package com.hsc.educenter.controller;


import com.google.gson.Gson;
import com.hsc.commonutils.JwtUtils;
import com.hsc.educenter.entity.UcenterMember;
import com.hsc.educenter.service.UcenterMemberService;
import com.hsc.educenter.utils.ConstantWxUtils;
import com.hsc.educenter.utils.HttpClientUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

//@CrossOrigin //gateway解决了可以注掉
@Controller  //只是请求地址，不需要返回数据
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //获取扫描人，添加信息
    @GetMapping("callback")
    public String callback(String code, String state){
        try {

            //获取code值，临时票据，类似验证码

            //拿着code请求微信固定的地址，得到两个值access_token和openid

            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数：id 密钥 和code值
            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);
            //请求这个拼接好的地址：得到返回得两个值access_token和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
            //从accessTokenInfo中获取两个值access_token和openid
            //把accessTokenInfo字符转转换成map集合，根据map里面key获取对应值
            //使用json工具转换Gson
            Gson gson = new Gson();
            HashMap mapAccessTokenInfo = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String) mapAccessTokenInfo.get("access_token");
            String openid = (String) mapAccessTokenInfo.get("openid");
            //3拿着得到得token和openid，再去请求微信提供的固定地址，得到扫描人信息
            //访问微信得资源服务器，获取用户信息


            //把扫码人信息添加到数据库中
            //判断数据表里面是否存在相同微信信息，根据openid判断，因为这是唯一的
            UcenterMember member = memberService.getOpenIdMember(openid);
            if(member==null){ //member是空，说明暂时没用该微信用户信息，可以注册
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid);
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                HashMap userMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String) userMap.get("nickname");  //昵称
                String headimgurl = (String) userMap.get("headimgurl"); //头像
                //根据微信获得的用户信息，添加到数据库中
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后返回首页面，通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            e.printStackTrace();
        }
        return null;
    }

    //生成微信扫描二维码
    @GetMapping("login")
    public String getWxCode() {
        //固定地址，后面拼接参数
//        String url = "https://open.weixin.qq.com/" +
//                "connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";

        // 微信开放平台授权baseUrl  %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "utf-8");
        }catch(Exception e) {
        }

        //设置%s里面值
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );

        //重定向到请求微信地址里面
        return "redirect:"+url;
    }

}
